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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b5e6d4563d0e0be213c50ee7a313aba4c7b1b5e522b0b92e7edc12e6701e0cc' 
  AND token = 'eUCbyKo6Sj/DKiLIBcuvJSp5DM7rzzxn9G5nuc22Ezo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}